电工技术学报  2018, Vol. 33 Issue (2): 238-244    DOI: 10.19595/j.cnki.1000-6753.tces.L70358
电机与电器 |
一种优化表插式永磁电机性能的方法
鲍晓华, 吴长江, 胡云鹏, 王春雨
合肥工业大学电气与自动化工程学院 合肥 230009
A Method for Optimizing Performance of Inset Permanent Magnet Motor
Bao Xiaohua, Wu Changjiang, Hu Yunpeng, Wang Chunyu
School of Electrical Engineering and Automation Hefei University of Technology Hefei 230009 China
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摘要 针对表插式永磁同步电机转矩脉动较大的问题,提出在永磁体磁极间开辅助槽的方法提升电机性能。分析磁极间开槽的原理,指出在磁极间开槽能够改善气隙磁场分布,减小反电动势中的谐波含量,进而使电机转矩脉动得到抑制。并且磁极间开槽会改变电机的交、直轴电感,使电机的弱磁扩速能力得到提升。利用有限元分析得出最佳开槽形状,并验证开辅助槽能减少反电动势谐波含量并抑制转矩脉动;通过仿真计算电机电感变化,并对比等效直轴去磁状态下电机的气隙磁通密度波形与以不同最高转速时所需的直轴电流,得出开槽后的表插式永磁同步电机更适合用于弱磁扩速。本文所研究的新结构对提升电机性能有一定的指导意义。
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关键词 表插式永磁电机辅助槽转矩脉动弱磁扩速直轴电感    
Abstract:Because of the large torque ripple of inset permanent magnet synchronous motor (PMSM), a method of notching auxiliary slots between adjacent permanent magnets is proposed to improve the performance of PMSM. The principle of notching auxiliary slots is analyzed. The auxiliary slots between poles can improve the distribution of air-gap flux density and reduce the harmonic content of back EMF, thus, the torque ripple can be suppressed. The auxiliary slots between the poles will change quadrature-axis and direct-axis inductance of the motor, accordingly its ability of flux-weakening will be improved. Finite element analysis (FEA) is used to acquire the best slot shape. It is verified the auxiliary slots can reduce the harmonics of back EMF and restrain the torque ripple. The motor inductances are calculated by FEA. The air gap flux densities of different rotor structures are compared under equivalent demagnetization status and d-axis current at different maximum speed. It is shown that the inset PMSM with auxiliary slots is more suitable for speed control of flux-weakening. The new proposed structure will provide a certain reference value for improving the performance of motor.
Key wordsInset permanent magnet synchronous motor    auxiliary slot    torque ripple    speed control of flux-weakening    direct-axis inductance   
收稿日期: 2017-04-19      出版日期: 2018-01-31
PACS: TM351  
作者简介: 鲍晓华 男,1972年生,教授,博士生导师,研究方向为电机设计理论与技术,电机电磁场理论分析与计算,大型电机及高速电机的可靠性技术。E-mail: baoxh@hfut.edu.cn(通信作者);吴长江 男,1991年生,硕士研究生,研究方向为永磁电机设计及优化。E-mail: wuchangjiang@mail.hfut.edu.cn
引用本文:   
鲍晓华, 吴长江, 胡云鹏, 王春雨. 一种优化表插式永磁电机性能的方法[J]. 电工技术学报, 2018, 33(2): 238-244. Bao Xiaohua, Wu Changjiang, Hu Yunpeng, Wang Chunyu. A Method for Optimizing Performance of Inset Permanent Magnet Motor. Transactions of China Electrotechnical Society, 2018, 33(2): 238-244.
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